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#2 ptkdb 1.231 - patch for proximity window

The proximity window may become a serious drawback while debugging
code which deals with large structures like array or hashes.
The point is that the proximity window always open the
structures up to the first level. This may take some time on flat arrays
with several thousand of items.
Of course, one may temporary switch off the window by means of menu option 'Data/Show Proximity Window'.

This patch solves this problem setting the depth on refresh to zero and resetting
them at the current real depth only when the user requests an expansion.

If you want to apply it, please do the following changes on module ptkdb.pm